Garnetted stock is textile waste — including old fabrics, rags, or fiber waste — that has been mechanically pulled apart (garneted) back into a fibrous state. Yarn waste, by contrast, consists of off-cuts, broken ends, and remnants from yarn manufacturing that have not been re-opened. Both fall within synthetic fiber waste when the source fiber is synthetic, but their physical form and downstream utility differ: garnetted stock is typically used for lower-grade nonwovens or stuffing, while clean yarn waste may be re-spun into recycled yarn.

Synthetic fiber waste shipments may be subject to review under Basel Convention controls if the material is classified as hazardous waste, though clean, sorted textile fiber waste is generally exempt. US Customs may also scrutinize fiber waste imports to confirm they are not being used to circumvent trade-remedy orders on virgin fiber. Importers should maintain clear documentation of the waste's origin, fiber type, and processing history.